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				So what could he realistically expect with: 
-CM3000
			
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 The preamp in the 3000 would be overloaded.
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				-DB8e with one bay pointed at: at the 97~101° direction 
-the second bay pointed at: 188° direction
			
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 The only way to tell is to try it.
The preamp would be overloaded by CJOH unless you insert a HLSJ, UVSJ, or a custom Tin Lee bandstop filter for CH 6 before it.
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				Preamp signal of DB8e + CM signal combined and ran into the home to one tv
			
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 The same signals from each antenna would interfere with each other at the combiner.
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				And to clarify the expectation, we are not expecting to pick up EVERY channel like a CATV tower but the feasibility of picking up: 
CJOH-TV (6) 
to 
WWTI-DT (21 (50.1) -10.3 db
			
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 Not easily done. Too many signals, in too many directions, on too many TV bands, with too much difference in signal strength.
I suggest starting small with just the most important channels, and build on that.  For example, he has 3 CBC:
real channel 11, CKWS
real channel 30, CKWS
real channel 12, CHEX
does he really need all three?